Engineering the magnetic anisotropy of ferromagnetic metal films under electric field
首发时间:2014-10-03
Abstract:We propose that it is possible to engineer both the magnetic anisotropy energy (MAE) and the electric field modification of the MAE of ferromagnetic films. Using our recently developed orbital selective external potential (OSEP) method, we have unambiguously identified different contributions of each atomic orbital to the MAE of the ferromagnetic metal films, and find that the occupation of 3 dz2orbital is the key issue for the system to display large electric field response. Based on the theoretical conclusion, we have successfully designed several interesting Fe monolayers which demonstrate dramatically different MAE and could exhibit strong electric field control of magnetism. Our work may open a new avenue to the artificial design of electrically controlled magnetic devices.
keywords: Magnetic anisotropy, Electric field control, orbital selective external potential (OSEP)
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外加电场下对铁磁性金属薄膜的调控的研究
摘要:本文中,首先基于已有研究,我们猜测认为可以通过一定手段对电场调控铁磁薄膜的磁各向异性能(Magnetic anisotropy energy, MAE)的磁电效应进行有效调节。而通过应用最新发展的选择性轨道加场法(orbital selective external potential, OSEP), 我们发现铁磁金属薄膜中的原子的每个轨道对体系MAE的贡献不尽相同,而且3 dz2轨道的占据对于增强体系的MAE对于电场相应起非常关键的作用。从这些理论结果出发,我们成功地设计了不同结构的Fe薄膜体系,其MAE数值表现出了很大的不同,且能够造成外加电场对于其MAE很强的控制作用。因此,我们认为此工作开辟了一个崭新的途径来对相关电控磁器件进行设计开发。
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No.4611574100708014****
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